Feature: 1. You can easily transfer cassette music to your headset or speaker, no need to connect wired headset or speaker to the cassette player. 2. The auto reverse function allows you to listen to the AB sides of the tape repeatedly without having to change the sides manually. 3. Built in Bluetooth transmitter, automatically start searching for paired Bluetooth receiving devices, and remind you the status by indicator lights. 4. Volume adjustment knob and headphone jack, you can connect headphones to listen to music when you don't want to use Bluetooth devices. 5. Five function buttons play, stop, fast forward, fast reverse and loop; 2 power supply options, two AA batteries, or USB power. Specification: Item Type: Bluetooth Cassette Player Material: ABS Bluetooth: 4.2 Effective Distance: About 10m / 33ft (Related to the bluetooth receiving device and the surrounding environment) Audio Channel: Left and Right Channel Stereo Audio Input: Cassette Tape Audio Output: Headphone Jack (3.5mm Stereo Audio Interface), Bluetooth Transmitter User Interface: Function Buttons-Play, Stop, Fast Forward, Fast Rewind, Cycle Switch, Automatic Return. Volume Adjustment Knob, Bluetooth Work Indicator-Blue fast flashing means searching for pairing, slow flashing means pairing successful working, off indicates that the pairing was not successful. Power Supply: 2 X AA Batteries, or DC 5V USB Power Supply (This product does not come with batteries). Package List: 1 x Bluetooth Cassette Player 1 x USB Cable1 x Headphone 1 x Manual Note: USB power supply or 2 x AA batteries. (This product does not come with batteries.)